Posted: 01/05/2013 at 16:19
It's not unusual for Rhubarb to send up flowers spikes. I have 8 crowns. Some send up flower spikes, some don't. You did the right thing by cutting the flower spike off. The plants use high levels of energy producing seed which is just a waste. I usually cut the stem off as close to soil level as I can.
If you think the soil is rich, then just leave it be. If you have concerns about the levels of nutrients, try a sprinkle of pelleted chicken manure around the base of each crown.